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  <title>Bug 1099807 - Intra-level whitespace pairing</title>
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  <p><ruby>
    <rb>a</rb><rb pseudo><span> </span></rb><rb>b</rb>
    <rt>x</rt><rt pseudo><span> </span></rt><rt>y</rt>
  </ruby></p>
  <p><ruby>
    <rb>a</rb><rb pseudo><span> </span></rb><rb>b</rb>
    <rt>x</rt><rt></rt><rt>y</rt>
  </ruby></p>
  <p><ruby>
    <rb>a</rb><rb pseudo></rb><rb>b</rb>
    <rt>x</rt><rt pseudo><span> </span></rt><rt>y</rt>
  </ruby></p>
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